Date.prototype.between = function(dStart) {
	var start = dStart.getTime();
	var end = this.getTime();
	if (start > 0 && end == 0) {
		return new Date().between(dStart);
	} else if (start == 0 || end == 0) {
		return "-";
	} else if (start == -1 && end == -1) {
		return "-";
	}

	var mid = end - (start < 0 ? 0 : start);
	var builder = '';
	if (mid >= 3600000) {
		builder += Math.floor(mid / 3600000) + ":";
		mid = mid % 3600000;
	}
	if (mid >= 60000) {
		var minute = Math.floor(mid / 60000);
		if (builder && minute < 10) {
			builder += "0";
		}
		builder += minute + ":";
		mid = mid % 60000;
	} else if (builder) {
		builder += "00:";
	}

	if (builder) {
		var sec = Math.floor(mid / 1000);
		if (sec < 10) {
			builder += "0";
		}
		builder += sec;
	} else {
		builder += mid / 1000;
	}
	return builder;
}

Date.prototype.format = function(mask) {
	var d = this;
	
	if (!mask) {
		var c = new Date();
		if (c.getFullYear()==d.getFullYear() && c.getMonth()==d.getMonth() && c.getDate()==d.getDate()) {
			mask = 'HH:mm:ss';
		} else {
			mask = 'MM/dd HH:mm:ss';
		}
	}
	
	var zeroize = function (value, length) {
		if (!length) length = 2;
		value = String(value);
		for (var i = 0, zeros = ''; i < (length - value.length); i++) {
			zeros += '0';
		}
		return zeros + value;
	};
	
    return mask.replace(/"[^"]*"|'[^']*'|\b(?:d{1,4}|m{1,4}|yy(?:yy)?|([hHMstT])\1?|[lLZ])\b/g, function($0) {
    	switch($0) {
			case 'd':		return d.getDate();
			case 'dd':		return zeroize(d.getDate());
			case 'ddd':		return ['Sun','Mon','Tue','Wed','Thr','Fri','Sat'][d.getDay()];
			case 'dddd':	return ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'][d.getDay()];
			case 'M':		return d.getMonth() + 1;
			case 'MM':		return zeroize(d.getMonth() + 1);
			case 'MMM':		return ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'][d.getMonth()];
			case 'MMMM':	return ['January','February','March','April','May','June','July','August','September','October','November','December'][d.getMonth()];
			case 'yy':		return String(d.getFullYear()).substr(2);
			case 'yyyy':	return d.getFullYear();
			case 'h':		return d.getHours() % 12 || 12;
			case 'hh':		return zeroize(d.getHours() % 12 || 12);
			case 'H':		return d.getHours();
			case 'HH':		return zeroize(d.getHours());
			case 'm':		return d.getMinutes();
			case 'mm':		return zeroize(d.getMinutes());
			case 's':		return d.getSeconds();
			case 'ss':		return zeroize(d.getSeconds());
			case 'l':		return zeroize(d.getMilliseconds(), 3);
			case 'L':
				var m = d.getMilliseconds();
				if (m > 99) m = Math.round(m / 10);
				return zeroize(m);
			case 'tt':		return d.getHours() < 12 ? 'am' : 'pm';
			case 'TT':		return d.getHours() < 12 ? 'AM' : 'PM';
			case 'Z':		return d.toUTCString().match(/[A-Z]+$/);
			// Return quoted strings with the surrounding quotes removed
			default:		return $0.substr(1, $0.length - 2);
    	}
    });
};
